<template>
    <div>
        <!-- 面包屑导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
       </el-breadcrumb>
       <!-- 卡片视图区域 -->
       <el-card class="box-card">
           <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon>
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :active="activeIndex - 0" align-center finish-status="success">
                <el-step title="基本信息" ></el-step>
                <el-step title="商品参数" ></el-step>
                <el-step title="商品属性" ></el-step>
                <el-step title="商品图片" ></el-step>
                <el-step title="商品内容" ></el-step>
                <el-step title="完成" ></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addForm_rules" ref="addForm_ref" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                        v-model="addForm.goods_cat"
                        :options="cateList"
                        :props="cateProps "
                        @change="cateChange" clearable>
                    </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for = "item  in manyTabData" :key="item.attr_id" >
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key = "i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item label="item.attr_name" v-for = "item  in onlyTabData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                        class="upload-demo"
                        :action="uploadURL" :on-success="handleSuccess"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headersObj">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor
                            ref="myQuillEditor"  v-model="addForm.goods_introduce" >
                        </quill-editor>
                        <!-- 添加按钮 -->
                        <el-button class="addBtn" type="primary" @click="addGoods">添加按钮</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
       </el-card>

        <!-- 图片预览的对话框 -->
        <el-dialog
            title="图片"
            :visible.sync="previewVisible"
            width="50%"
           >
            <img :src="previewURL" alt=""  class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
export default {
    data (){
        return {
            activeIndex: '0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_number: 0,
                goods_weight: 0,
                goods_cat: [],
                pics: [],
                goods_introduce:'',
                attrs: []
            },
            addForm_rules: {
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_number:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_weight:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat:[
                    { required: true, message: '请选择商品分类', trigger: 'blur' },
                ]
            },
            cateList:[],
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
            },
            manyTabData:[],
            onlyTabData:[],
            // 图片上传的路径
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 手动拼接请求头
            headersObj:{
                Authorization: window.sessionStorage.getItem('token')
            },
            previewURL: '',
            previewVisible: false
        }
    },

    created (){
        this.getCateList();
    },

    methods:{
        // 获取分类列表
        async getCateList (){
            const {data:res} = await this.$http.get('categories');
            if (res.meta.status !== 200) {return this.$message.error('获取商品分类失败')};
            this.cateList = res.data;
        },
        cateChange (){
            if ( this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = [];
            }
        },
        // 为切换Tab栏设置条件
        beforeTabLeave (activeName, oldActiveName){
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类')
                return false;
            }
        },
        // 监听Tab栏切换事的处理函数
        async tabClicked(){
            if (this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                sel: 'many'}
                });
            res.data.forEach(item =>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                })
            this.manyTabData = res.data;
            // console.log(this.manyTabData);
            }; 
            if (this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                sel: 'only'}
                });
            this.onlyTabData = res.data;
            }
        },
        // 图片预览
        handlePreview(file){
            this.previewURL = file.response.data.url;
            this.previewVisible = true;
        },
        // 图片移除
        handleRemove(file){
            const i = this.addForm.pics.findIndex(item =>{
                item.pic === file.response.data.tmp_path;
            });
            this.addForm.pics.splice(i,1);
            // console.log(this.addForm.pics);
        },
        // 监听图片上传成功
        handleSuccess(response){
            const picInfo = {pic:response.data.tmp_path};
            this.addForm.pics.push(picInfo);
            // console.log(this.addForm.pics);

        },
        // 添加商品
        addGoods(){
            this.$refs.addForm_ref.validate( async valid =>{
                if (!valid) { return this.$message.error('请填写必要的表单项')}
                                // 处理动态参数
                this.manyTabData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    };
                    this.addForm.attrs.push(newInfo);
                });
                // 处理静态属性
                this.onlyTabData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    };
                    this.addForm.attrs.push(newInfo);
                });
                const newAddFrom = this.addForm;
                newAddFrom.goods_cat = newAddFrom.goods_cat.join(',');
                const {data:res} = await this.$http.post('goods', newAddFrom)
                if (res.meta.status !== 201) {return this.$message.error('添加商品失败')}
                this.$message.success('添加商品成功');
                // console.log(newAddFrom);
                this.$router.push('/goods')
            })
        },
        // 封装深拷贝函数
        cloneDeep(newObj, oldObj){
            for (var k in oldObj) {
                var item = oldobj[k];
                if (item instanceof Array) {
                    newObj[k] = [];
                    cloneDeep (newObj[k], item);
                }else if (item instanceof Object){
                    newObj[k] = {};
                    cloneDeep (newObj[k], item);
                }else{
                    newObj[k] = item;
                }
            }
        }
        
    },

    computed: {
        // 获取被选中分类的ID
        cateId(){
            if (this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2];
            }else{
                return null;
            }
        },
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}

.previewImg{
    width: 100%;
}

.addBtn{
    margin-top: 15px;
}

</style>